<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>CSS样式</title>
	<link rel="stylesheet" href="./css/css.css">
	<!-- 网页内部  -->
	<style>
		.css{
			font-size: 50px;
			color: #ff6700;
		}
		#firstDiv{
			color: #00BBFF;
		}
		#secondDiv{
			color: #6D56FF;
		}
	</style>
</head>
<body>
	<h2>外接</h2>
	<div>
		divcss数据科学与大数据技术专业
	</div>
	<div>
		divcss理学系
	</div>
	<h2>内接</h2>
	<span style="color: #00BBFF;">
		6-30位字母、数字或“_”,字母开头
	</span>
	<h2>class选择器</h2>
	<p class="css">段落2</p>
	<span class="css">这是个提示</span>
	<h2>id选择器</h2>
	<div id="firstDiv">java研发工程师</div>
	<div id="seconDiv">Javadashujugcs</div>
</body>
</html>